Is serotonin responsible for the stimulative effect of the extracardiac nerve in Helix pomatia?

S.-Rózsa, Katalin and Graul, Christa (1964) Is serotonin responsible for the stimulative effect of the extracardiac nerve in Helix pomatia? A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 31. pp. 85-96. ISSN 0365-3005

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Abstract

1. Our experiments prove that at the stimulation of the intestinal nerve of Helix pomntia L. both stimulating and inhibiting effects can be elicited, depending on the parameters of the exciting current. The appearance of the stimidating effect is strongly influenced by the seasonal changes. 2. The stimulating action of the intestinal nerve is realized by a chemical agent prompting the recipient snail’s heart to the same activity which effect is elicited by the stimulation of the nerve in the donor heart. 3. Thé serotonin brought in from outwards and the stimulating effect arising on the stimulation of the intestinal nerve can be both warded off by antiserotonin substances (BOL, chlorpromazine). Also LSD exercises similar action in both cases. 4. On the grounds of the similar effect of serotonin and intestinal nerve as well as of the action of antiserotonin substances on these effects it is assumed that the stimulating mediator of the extracardial nerve of the Helix is serotonin.

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